@fatdog This link is a pretty good one.
Tribes are all over the map (in a manner of speaking), in that they all have their own codes. Most tribal courts only deal with municipal code leaving criminal matters up to the feds, but there are a few rare exceptions. Also tribes also have their own differing agreements with the BIA and what the BIA allows them to handle on their own and tribal services vary greatly. As stated in that link, his info is only a starting point. It gets very time consuming trying to get a handle on what you can do and what you can't on tribal lands. It also happens to be that the tribes themselves don't even know what's allowed in some cases.
I looked into it a bit sometime back when I was considering moving onto tribal land. My ex-wife was a tribal member. This particular tribe also opened a gun range complete with machine gun rentals on tribal land! That got me interested in finding out just how that was possible. This particular tribe had a pretty solid firearms stance, as it turns out. That's not the case across the board.